Mortise-gage.



' block in broken lines.

UNITED STATES PATENT 0FFICE JOHN A. BENGTSON, OF CROMPTON, RHODE ISLAND.

MORTISE-GAGE;

SPECIFICATION forming part of Letters Patent No. 724,077, dated March31, 1903. Application filed October 16,1902; Serial No. 127,612. (Nomodel.)

To all whom it may concern:

Be it known that I, JOHN A. Bnnerson, a citizen of the United States,residing at Orom pton, in the county of Kent and State ofRhode Island,have invented a new and useful Improvement in Mortise-Gages, of whichthe following is a specification.

This invention has reference to an improvement in a mortise-and-tenongage; and it consists in the peculiar and novel construction of thegage, as will be more fully set forth hereinafter.

The object of the invention is to construct a graduatedmortise-and-tenon gage so that the two sliding parts of the gage may beindependently adjusted and secured in the adj usted position by oneclamp-screw and marking-disks rotatably supported on the sliding rods.

Figure 1 is a side view of my improved mortise-gage, showing the sameadjusted to mark a tenon or mortise one inch from the end of thegage-block. Fig. 2 is a longitudinal sectional View of the same. partlyin section, showing the gage in the closed position in solid linesandthewidthgage extended beyond the face of the gage- Fig. 4 is atransverse sectional view showing. the two gage-rods clamped by the saidscrew.

In the drawings, a indicates the gage-block, which is provided with acylindrical bore a and has the flanged end a projecting, preferablyfinall directions beyond the gage-block a and forming the contact-face a Inthe contact-face a? the cavity a is formed, and in the gage-block Ct thethumb-screw 0, extends radially from the center of the cylindrical borea. In the bore a of thegage-block the slotted tube 19 is supported, soas to slide freely longitudinally. Within the slotted tube 1) issupported the cylindrical rod 0. The thumb-screw a is in screw-threadengagement with the gage-block and has at its inner end the cylindricalprojection. a", which extends through the slot b in the tube b, so thatthe end of the thumb-screw can bear on the cylindrical rod 0 and forcethe same against the wall of the slotted tube 1) and Fig. 3 is a topview,

clamp this tube b against the wall of the cylindrical bore a in thegage-block. The r0- tatable marking-disk b is provided with a tubularprojection 12 which enters a socket b in the end of the tube 6. Thetubular projection b is provided with a peripheral groove into which thepin b enters. The markingdisk '5 may therefore revolve freely and isheld against longitudinal movement by the pin If. The marking-disk c isrotatably supported on the end of the cylindrical rod 0 by means of thescrew-post 0 secured by screwthread engagement in the end of thecylindrical rod. The cylindrical rod 0 is graduated from the markingedge of the markingdisk 0', which forms the zero of the graduation. Theslotted tube b is graduated from the marking edge of the marking-disk b,the marking edge of the disk forming the zero of the graduation. Thegage may be used as a widthgage by adjusting the slotted tube so thatthe rotatable marking-disk b is contained within the cavity a in thegage-block a.

Having thus described my invention, I- claim as new and desire to secureby Letters Patent 4 1. In a mortise-gage, the combination with agage-block having a cylindrical bore, a slotted tube and a rotatablemarking-disk mounted in the end of the tube, of a cylindrical graduatedrod supported in the slotted tube, a rotatable marking-disk supported inthe end of the tube; and a clamping-screwadapted to bear on thecylindrical rod, whereby the slotted tube and rod'are held in apredetermined position, as described.

2. In a mortise-gage, a gage-block, acavity in the face of thegage-block, a graduated longitudinally-slotted tube, in combination witha cylindrical graduated rod and rotatable marking-disks mounted on theends of the slotted tube and the cylindrical rod, and means comprising athumb-screw whereby the slotted tube and graduated rod are held in apredetermined position, as described.

3. In a mortise-gage, the combination with the gage-block a, thecylindrical bore a in the gage-block, the cavity a, the flange a and thethumb-screw a, of the graduated and longitudinally-slotted tube 1 therotatable name to this specification in the presence of marking-disk bthe tubular projection b on two subscribing Witnesses. the marking-disk,a peripheral groove on the V 7 projection b the pin 1), the graduatedrod 0 JOHN BENGTSON' and the rotatable marking-disk 0 supportedWitnesses: on the end of: the rod 0, as described. ADA E. I-IAGERTY,

In testimony whereof I have signed my JOS. A. MILLER, Jr.

